Imaginary Picture of K2-173 b

Display orbital revolution of K2-173 b around the hoststar K2-173
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Exoplanet Name : K2-173 b
Alternate Name : "2MASS J04012997+1537300 b, EPIC 210512842 b, EPIC 210512842.01, WISE J040130.02+153730.3 b"
Status : Confirmed
Radius (Rjup / Re): 0.1430 (Rjup) 1.6029 (Rearth)
Mass (Mjup / Me): 0.0129 (Mjup) 4.0914 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0610 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0161
Orbital Period(Observed/Estimated) 5.87 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 1.5925
Star Radiation at Atmospheric Boundary: 225307.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 972.4 (K)
Blackbody T 0.3(K) 913.2 (K)
Blackbody T 0.7(K) 738.9 (K)
Tidally Locked Blackbody T 0.1(K) 1156.4 (K)
Tidally Locked Blackbody T 0.3(K) 1085.9 (K)
Size Class: super-Earth-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-173
Alternate Name : "2MASS J04012997+1537300, EPIC 210512842, WISE J040130.02+153730.3"
Star Distance(LY) : 750.6
Stellar Radius(Rsun) : 0.8 (Rsun Measured)
Stellar Mass(Msun) : 0.9 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5580 (K)
Spectral type : G6
UV portion[%]: 7.2
Visible portion[%]: 43.7
IR portion[%]: 49.0
Metalicity : -0.2
Absolute Magnitude: 4.0
Apparent Magnitude: 10.8
Right Ascension(RA) 60.3749
Declination (DEC) 15.6250
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
K2-173 b
K2-173 b

  • K2-173 b is an exoplanet orbiting the star K2-173, located about 750.6 light-years (230.1 pc) away from Solar System. Its discovery was publicly announced on 2018.
  • The host star K2-173 has apparent magnitude of 10.8, with absolute magnitude of 4.0.
  • It is 0.9 times more massive and 0.8 times bigger compared with our Sun. The surface temperature is 5580 with its spectral types of G6
  • In this planetary system, the extrasolar planet K2-173 b orbits around the star K2-173 every 5.9 days with its orbital distance of 0.06 AU ( 9128246.9 km)
  • (Projected orbit of K2-173 b around its host star K2-173)


  • The Star K2-173 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.567 AU ( 84762898.0 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.783 AU ( 117164476.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.193 AU ( 178532733.2 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 1.756 AU ( 262718738.0 km)
  • Radiation at Planetary Boundary of K2-173 b : 225307.81 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-173)



  • Kopparapu Recent Venus for Star K2-173 distance : 0.594 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-173 distance : 0.752 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-173 distance : 0.727 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-173 distance : 0.797 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-173 distance : 1.336 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-173 distance : 1.409 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-173)



  • Original Kopparapu Recent Venus for Star K2-173 distance : 0.593 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-173 distance : 0.774 AU
  • Original Kopparapu Moist Greenhouse for Star K2-173 distance : 0.784 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-173 distance : 1.359 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-173 distance : 1.414 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-173)



    (Position in Stellar Map of star K2-173 and its Exoplanet K2-173 b)



    (Zoomed position in Stellar Map of star K2-173 and its Exoplanet K2-173 b (zoom level 3))

    (Synthetic Spectrum of star K2-173*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102